I'll be honest with you: since I have my iMac, I tried hard but just could not get used to how iPhoto arranges photos (using events instead of folders). Thus I started using Picasa for Mac that I was really pleased with. However, the only way I can import photos in Picasa is to plug in my iPhone.
To make use of iCloud's Photo Stream feature where photos taken on your iPhone get uploaded to iCloud automatically over the air and so can be displayed immediately on your Mac or PC, without the need to wire connect your iPhone to it, I was looking for a way to either find the Photo Stream folder location on the iMac, or for Picasa to connect with iCloud directly. Well, as it came out, the combination of the two can be made possible with Automator!